Add BACKEND_GET_THEME event.
Add getArticle event.
Add getContentElement event.
Add AddEnclosureToTemplateEvent.
Add AddImageToTemplateEvent.
Fix typo.
Add GetCalendarEventEvent.
Add GenerateFrontendUrlEvent.
Add GetTemplateGroupEvent.
Fix phpdoc.
Rename GetContentElementEvent::[sg]etContentElement() into ::[sg]etcontentElementHtml().
Rename GetCalendarEventEvent::[sg]etCalendarEvent() into ::[sg]etCalendarEventHtml().
Remove GetCalendarEventEvent::$teaserOnly.
Add GetNewsEvent.
Fix a lot of typos according to code style.
phpDoc and code style.
Merge branch 'master' into contao-2.11

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